#4 Floyd 'Money' Mayweather
Floyd 'Money' Mayweather has expressed quite a bit of interest in squaring off against Khabib Nurmagomedov. The undefeated boxer is keen on fighting the UFC Lightweight Champion, and has revealed his interest to the media.
The two fighters have even discussed terms of their fight, though Dana White appears determined to make sure that if the fight happens it should happen inside a UFC Octagon.
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Nurmagomedov, on the other hand, has even talked about leaving the UFC to get the fight against Mayweather if that is what is necessary. It is unlikely that Mayweather will agree to an MMA fight, as the Boxer prefers to stick to his strengths. He defeated Conor McGregor a year back, as well as Tenshin Nasukawa a few days ago.
With that in mind, a fight between Nurmagomedov and Mayweather would likely spike interest among the fans.
Given the hype this would generate among the fans as well as the fighters, this one could actually happen.